The verb "estar" in the present tense is conjugated as follows:
- Yo estoy (I am)
- Tú estás (You are - informal)
- Él/Ella/Usted está (He/She/You - formal - are)
- Nosotros/Nosotras estamos (We are)
- Vosotros/Vosotras estáis (You all are - informal in Spain)
- Ellos/Ellas/Ustedes están (They/You all - formal - are)
Here is a sentence using one of the forms:
Yo estoy en la escuela.
(I am at school.)